I never used a power washer, but we do shoot it with water at high speed to clean it - maybe we messed it up. No backwash.

The reason I'm trying to verify the pump thing is that we have had this pool for 10+ years without much of a problem. It seemed like my husband put a bottle of some kind of "Low Chlor" ?? stuff in every 3 months & kept the chlorine from the pool store in it & it was almost always clear. Then we drained it & replaced the liner & refilled. Changed cartridge at the same time, had a pool guy for a month or so & left most of the summer - so there are a lot of variables.

For the last 2 1/2 months we've been battling green & cloudy endlessly. So, when I go tell DH it's too strong of a pump - he wonders "Well, we never had a problem before......" That's why I was trying to brainstorm other ideas before making an investment in a new filter or pump. $$

How would I know if it is "plumbed wrong"? Thanks for the ideas,

Jennifer